Anniversary can't be edited/created on android

Hi,
If I create a contact on my owncloud server, I can add anniversary data and it’s correctly sync with android.
However, if I create a davdroid contact on the phone, anniversary does not appear on the field list, and I can’t edit those from already existing contact.
Davdroid 0.6.12 on galaxy s4, android 4.3
Server owncloud 7.02

Sorry, I had a transmission issue : the field I’m referring to is birthday, not anniversary. Here is an example of the vcf file from owncloud :
BEGIN:VCARD
VERSION:3.0
UID:c8442c3a-48a4-4a2e-a475-96c8677050bb
FN:Aaaaaaa
N:;Aaaaaaa;;;
PRODID:-//ownCloud//NONSGML Contacts 0.3.0.18//EN
REV:2015-03-06T18:18:36+00:00
BDAY;VALUE=DATE:1980-01-01
END:VCARD
As you can see, it uses BDAY. Moreover, the issue is slightly different : The birthday is sync, only it can’t be edited/created on the android side: